What should I do about this girl that I really like?

we started seeing each other for about 4 months now. We only went on 2 dates because of her tight schedule but I’m fine with that. Everything was great until recently, we chat on WhatsApp alot but now she don’t respond to me on time, she sometimes takes up to 10 hours before responding to me. When I asked her why she said because of work she sometimes forget to respond but she would be online on WhatsApp. When we meet things are still great but it’s just that she stopped responding to me on time. But whenever we go out we usually have good time together..